N NinjaX3 Jun 2019 23 0 New York Jun 29, 2019 #1 How do you add up 27 and 48 in your head? My method 20 + 40=60, 60 +7=67, 67+8=75. What is your method?

How do you add up 27 and 48 in your head? My method 20 + 40=60, 60 +7=67, 67+8=75. What is your method?

D DarnItJimImAnEngineer Jun 2019 493 262 USA Jun 29, 2019 #2 For me, it goes, "sixty; sixty-seven; sixty-tenty-five," which is more-or-less the same thing. Reactions: 2 people

topsquark Math Team May 2013 2,443 1,012 The Astral plane Jun 29, 2019 #3 NinjaX3 said: How do you add up 27 and 48 in your head? My method 20 + 40=60, 60 +7=67, 67+8=75. What is your method? Click to expand... An abacus. -Dan

NinjaX3 said: How do you add up 27 and 48 in your head? My method 20 + 40=60, 60 +7=67, 67+8=75. What is your method? Click to expand... An abacus. -Dan

N NinjaX3 Jun 2019 23 0 New York Jun 30, 2019 #5 Cool! that's how you solve that problem in your mind. Sent from my SM-J727T1 using Tapatalk

N NinjaX3 Jun 2019 23 0 New York Jun 30, 2019 #6 DarnItJimImAnEngineer said: For me, it goes, "sixty; sixty-seven; sixty-tenty-five," which is more-or-less the same thing. Click to expand... That is interesting, how you came up with that. I hadn't thought of it that way. Brilliant! Sent from my SM-J727T1 using Tapatalk Last edited by a moderator: Jul 1, 2019

DarnItJimImAnEngineer said: For me, it goes, "sixty; sixty-seven; sixty-tenty-five," which is more-or-less the same thing. Click to expand... That is interesting, how you came up with that. I hadn't thought of it that way. Brilliant! Sent from my SM-J727T1 using Tapatalk

N NinjaX3 Jun 2019 23 0 New York Jun 30, 2019 #7 topsquark said: An abacus. -Dan Click to expand... You could use that interesting. Sent from my SM-J727T1 using Tapatalk

topsquark said: An abacus. -Dan Click to expand... You could use that interesting. Sent from my SM-J727T1 using Tapatalk

O Otis Jun 2019 31 24 AZ, Seattle, San Diego Jun 30, 2019 #8 topsquark said: An abacus. Click to expand... In your head? Time for an upgrade! Reactions: 1 person

skeeter Math Team Jul 2011 3,266 1,766 Texas Jun 30, 2019 #9 $27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$ it's how Ramanujan would do it ... Reactions: 1 person

N NinjaX3 Jun 2019 23 0 New York Jun 30, 2019 #10 skeeter said: $27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$ it's how Ramanujan would do it ... Click to expand... Excellent, That is another way of doing it. [emoji106] Sent from my SM-J727T1 using Tapatalk

skeeter said: $27+48 = 3 \cdot 9+3 \cdot 16 = 3(9+16) = 3(25) = 75$ it's how Ramanujan would do it ... Click to expand... Excellent, That is another way of doing it. [emoji106] Sent from my SM-J727T1 using Tapatalk